Furnace-grate



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UNITED sTaTns PATENT OFFICE.'

MARCUS M. ROUNDS, OF NEW HAVEN, CONNECTICUT. y

FURNACE-GRATE.

Specification of Letters Patent No.`31,676, dated March 12, 1861.

To at! whom tt may concern: 1

Be it known that I, MARCUS M. RoUNDs, of New Haven, in the county of New Haven and State of Connecticut, have invented an Improved Grate for Locomotive-Engine or other Furnaces; and I do hereby declare the same to be fully described and represented in the following specication and the accompanying drawings, of which- Figure l, is a top view and Fig. Q, a longitudinal section of it.

The said grate is composed as follows:

First, of a series of two or more shafts A, A, A, A, arranged parallel to each other in a frame B, and each provided with two ranges or sets of projections, arms or grate There may be anydesirable number of suoli arms or grate bars in each series-those of the two series being made to project in one plane from the shaft, one series being extended from one side of it while the other projects from its opposite side as shown in the drawings. Each set of arms extends into the spaces between those of another set as represented in Fig. l. Each space which receives an arm should be wider than such arm.

Second, of two series of arms o, c, c, c, or comb grates C, C, which are arranged at the ends of the opening of the frame B, and project between the next adjacent set of arms of the next adjacent shafts as shown in the drawings.

From each rocker shaft an arm D, ex tends downward and is jointed to a long horizontal bar E, whose rear end is jointed to one arm of a bent or right angular lever F having its fulcrum, f, arranged as shown in Fig. 2. A lifter rod Gr, is jointed to the other arm of the lever and rises upward and with respect to the furnace, H, as shown in the drawings.

By moving the lifter rod up and down the several shafts A, A, A, with their rows of arms will be tilted or put in motion so as to cause fuel when resting on them to be shaken for the purpose of screening it of ashes. By raising the lifter high enough so as to cause the arms of one shaft to rise entirely above those of another with which they immediately coperate openings will be formed through which the fuel may be discharged from off the grate and into the space beneath it.

In order to preserve the shafts from being too rapidly burned and destroyed by the heat each may be made tubular and open at each of its ends so as to allow the air to circulate through it.

A grate so made is very advantageous for locomotive engine as well as many other furnaces or chambers for the combustion of fuel.

I do not claim the invention as Vdescribed and claimed inthe United States Patent No. 5232, as such invention has no stationary comb grates arranged and operating with the series of rocker grates as above described. The advantage ofthe stationary comb grates over movable grates or arms extended from a shaft is that the said comb grates prevent the series of rocker grates from be-V coming clogged and rendered immovable by coals catching between them and the ends of the furnace opening against which they project.

Vhile the lifter rod is being' moved up and down, it causes each set of arms of each of the rocker shafts to pass both above and below the horizontal line of the axis of the shaft. From whence it will be seen that' the arms which are next to either end of the grate opening will, while descending below such line be moved into an acute angle with the opening or so that coals will be liable to fall between the ends of the arms and such end of such opening. Then this takes place, the whole series of grates is apt to be estopped in action. By having the stationary comb grates,'the said diiculty is completely obviated.

I claim- The improved grate or combination of stationary comb grates and rocker grates arranged in relation to each other and made to operate together substantiallyin manner and for the purpose as described.

MARCUS M. ROUNDS. 

